A107373 - OEIS

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A107373

(n/2)*binomial(n-1,floor((n-1)/2)) - 2^(n-2).

0, 0, 1, 2, 7, 14, 38, 76, 187, 374, 874, 1748, 3958, 7916, 17548, 35096, 76627, 153254, 330818, 661636, 1415650, 2831300, 6015316, 12030632, 25413342, 50826684, 106853668, 213707336, 447472972, 894945944, 1867450648, 3734901296, 7770342787, 15540685574 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	REFERENCES	`Igor Pak, The area of cyclic polygons: Recent progress on Robbins' Conjectures, Adv. Applied Math. vol. 34 (2005), 690-696. Special issue in memory of David Robbins.`
	LINKS	`Igor Pak, Research Papers`
	MAPLE	`A056040 := n -> n!/iquo(n, 2)!^2:` `A133265 := n -> (n+2+(n-2)(-1)^n)/2:` `A107373 := n -> (A056040(n)A133265(n)-2^n)/4:` `seq(A107373(n), n=1..34); # Peter Luschny, Aug 30 2011`
	CROSSREFS	`Cf. A131019-A131021.` `Sequence in context: A018497 A178748 A194590 * A176662 A018526 A018542` `Adjacent sequences: A107370 A107371 A107372 * A107374 A107375 A107376`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jul 20 2007`

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Last modified February 16 15:27 EST 2012. Contains 205930 sequences.